Unique power saving mode: automatically adjust TFT backlight in standby mode, save power and prolong TFT life. Key backlight is controllable. Turn off the key backlight in standby mode. Complete access control: combination of multiple verification methods: it can support the opening of doors in a rich period of time; combination of multiple people; group combination of opening; duress of opening; anti dive back; double door interlock. Perfect alarm mechanism: anti demolition alarm, duress alarm, illegal door opening alarm, door open prompt, false alarm according to times. Fire linkage alarm.